Shortage may be driving up cost

Gas costs $3.75 in some places in the city. Above is the sign at the 7-Eleven on Gerrard Street.

A customer buys gas at a McClure store in Marion, Ind., earlier this month, where gas prices are about $3.85 a gallon. An AAAspokeswoman said one reason prices are higher earlier this year is because many oil refineries are performing maintenance and switching to summer blends earlier than usual — which means supply is down. (Photo by Jeff MoreheadAssociated Press)

WINCHESTER — Local gas prices have risen by roughly 40 cents per gallon during the past month, and they aren’t expected to go down anytime soon.